J. C. Crawford Jr. to J. G. Germuga on Respirators for Shop Prefabrication of Insulation (1952)

A one-page memorandum of June 17, 1952, from J. C. Crawford Jr. at Johns-Manville's headquarters to J. G. Germuga, headed "Shop Prefabrication of High Temperature Insulation." Crawford recommended "that respirators be used in any instance where shop prefabrication of insulation results in finely divided dust particles being broadcast," since "it is impossible to say from here when and how such dust can become a serious health hazard." He suggested that Mr. Crew's department send instructions to J-M's technical service units on respirators where dust was a problem, and that any such letter first "be cleared with Mr. H. M. Ball of the legal staff."

In Johns-Manville's chronology

Johns-Manville's own chronology of what the company knew describes this document as follows:

Letter from J.C. Crawford to J.G. Germuja, dated 6/17/52, entitled "Shop Pre-Fabrication of High Temperature Insulation" states that "it would be our suggestion that respirators be used in any instance where job pre-fabrication of insulation results in finely divided dust particles being broadcast. It is impossible to say from here when and how such dust can become a serious health hazard so that in any case where an operation results in prolonged dust production, it is recommended that respirators be used." Crawford suggests that "Mr. Crew's department forward appropriate instructions concerning respirators to J-M's technical service units." He further suggests that the instruction/letter be reviewed by Herbert Morton Ball of J-M's legal staff prior to sending.